Description of problem:


The fanout example is poorly written, it does not actually demonstrate what the
fan-out exchange does.

The fanout exchange copies messages to every queue that is bound to it, however
the example only binds
a single queue, so there's nowhere to fan out to. The listeners all bind to the
same queue and compete
for messages. If there are just a few then they're likely to all end up on the
same consumer,
because the broker delivers messages in batches for higher throughput.

I've attached a modified listener.cpp that creates a private queue for each
listener. If you start multiple
listeners you'll see they all get all the messages.